What is the system size? There are finite size corrections. As you increase the size it should converge Matthias On Dec 2, 2008, at 8:13 AM, zhian asadzadeh wrote:

Hi ADRIAN I run DMRG program for antiferromagnetic S=1/2 chain,but the result that i achieve for groun state energy doesn't concur with the result that has achieved from bethe ansats method (0.443147). I have changed m&sweep& number of sites(to 1000 site) but my result just 2 digit concur with 0.443147. I don't know what must i do. I will be very appreciate if you can guide me.

Thanks zhian